Charles H. Spurgeon on Psalms 12:6

What a contrast between the vain words of man, and the pure words of Jehovah. Man's words are yea and nay, but the Lord's promises are yea and amen. For truth, certainty, holiness, faithfulness, the words of the Lord are pure as well-refined silver. In the original there is an allusion to the most severely-purifying process known to the ancients, through which silver was passed when the greatest possible purity was desired; the dross was all consumed, and only the bright and precious metal remained; so clear and free from all alloy of error or unfaithfulness is the book of the words of the Lord. The Bible has passed through the furnace of persecution, literary criticism, philosophic doubt, and scientific discovery, and has lost nothing but those human interpretations which clung to it as alloy to precious ore. The experience of saints has tried it in every conceivable manner, but not a single doctrine or promise has been consumed in the most excessive heat. What God's words are, the words of his children should be. If we would be Godlike in conversation, we must watch our language, and maintain the strictest purity of integrity and holiness in all our communications.